Finding the Fourth Proportional to 891,801.72, 1,338,139.98 and 418,525.56

Step by Step Solution

1. Step 1: Write the proportion equation
   891,801.72 : 1,338,139.98 = 418,525.56 : x
2. Step 2: Convert to fraction form
   891,801.72/1,338,139.98 = 418,525.56/x
3. Step 3: Cross multiply
   891,801.72x = 1,338,139.98 × 418,525.56
4. Step 4: Simplify right side
   891,801.72x = 560,045,784,487.89
5. Step 5: Solve for x
   x = 560,045,784,487.89/891,801.72
6. Step 6: Final answer
   x = 627,993.61